JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <h3>Toggle</h3>
    <div class="root toggle">
        <div class="children"></div>
    </div>
</div>

<div class="container">
    <h3>Hover</h3>
    <div class="root hover">
        <div class="children"></div>
    </div>
</div>

CSS

div {
    margin: 0;
    padding: 0;
}
.container {
    display: inline-block;
}
h3 {
    margin: 0;
    text-align: center;
}

.root {
    width: 100px;
    height: 100px;
    padding: 20px;
    background-color: darkblue;
}
.children {
    display: none;
    width: 100px;
    height: 100px;
    background-color: #CCCCCC;
}
.hover:hover .children {
    display: block;
}

JavaScript

$('.toggle').toggle(
    function(){ $('.children', this).show(); },
    function(){ $('.children', this).hide(); }
);